bearing failure
the single row bearings require replacement at least once a year , more if you have hp and ride a lot.
converting to the newer splined counter shaft with the double row bearing will increase the life of the bearing by maybe 2x. I tore down my double row bearings this month in anticipation of heading out on vacation with my bike and wanting no problems 300 miles from home, out of the 7 bearing on my TS, only one bearing was usable.
If you convert, just buy 6205 double sealed bearings at NAPA or bearing shop or off the net, no advantage to the grease able bearings, failure will always be from stress not lack of lubrication.
Recently some of the minor parts to make the conversion have been on back order. The shaft/sprockets are the critical parts, IF you have a way to cut fairly accurate spacers out of 1" id heavy wall pipe and the parts blowup show the spacer lengths you need. You can save your self $150 and lots of messing around if you take your new splined shaft to a machine shop and have one of the female splines on the brake disc end ( short spline end ) cut to a 1/4" keyway to run your old brake disc. This simpler conversion does require making two odd spacers but nothing complicated, you will have additional splined shaft extending beyond the old brake disc and you need to make a spacer so you can tighten a nut on the brake disc end.
Replacing the two bolt single row bearing cups with the 4 bolt does require acurate drilling to keep everything in alignment. The original conversion kits had a guide plate to make it a 2 minute fail proof operation. I have one in my TS junk drawer and would rent it to you for price of shipping and deposit to get it back.
